MainActivity如下:

package cn.testshape;

import android.os.Bundle;

import android.app.Activity;

/**

 * Demo描述:

 * 自定义shape的使用

 */

public class MainActivity extends Activity {

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);

	}

}

main.xml如下:

<RelativeLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    >

    <Button

        android:layout_width="250dip"

        android:layout_height="50dip"

        android:text="测试自定义shape的使用"

        android:background="@drawable/background_selector"

        android:textColor="@drawable/textcolor_selector"

        android:layout_centerInParent="true"

        android:gravity="center"

      />

</RelativeLayout>

background_selector.xml如下:

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android" >

     <item android:drawable="@drawable/pressed_shape" android:state_pressed="true"/>

     <item android:drawable="@drawable/default_shape"/>

</selector>

default_shape.xml如下:

<?xml version="1.0" encoding="utf-8"?>

    <!-- 定义矩形rectangle -->

<shape xmlns:android="http://schemas.android.com/apk/res/android"

       android:shape="rectangle" >

    <!-- 定义边框颜色 -->

    <solid android:color="#d1d1d1" />

    <!-- 定义圆角弧度 -->

    <corners

        android:bottomLeftRadius="4dp"

        android:bottomRightRadius="4dp"

        android:topLeftRadius="4dp"

        android:topRightRadius="4dp"

    />

</shape>

pressed_shape.xml如下:

<?xml version="1.0" encoding="utf-8"?>

    <!-- 定义矩形rectangle -->

<shape xmlns:android="http://schemas.android.com/apk/res/android"

       android:shape="rectangle" >

    <!-- 定义边框颜色 -->

    <solid android:color="#7bb3f8" />

    <!-- 定义圆角弧度 -->

    <corners

        android:bottomLeftRadius="4dp"

        android:bottomRightRadius="4dp"

        android:topLeftRadius="4dp"

        android:topRightRadius="4dp"

    />

</shape>

textcolor_selector.xml如下:

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android" >

      <item android:color="#ffffff" android:state_pressed="true"/>

      <item android:color="#000000"/>

</selector>